Hayward HCB110BTA, Troubleshooting Manual

Page: 18 / 34

Common Error Codes
deF
HeatPro Display
FS
Summit Display
FS/deF on Display
FS or deF on the display is an indication that the
heat pump is in the defrost mode.
If outdoor ambient temperatures are low to mid 50’s
or below this is normal operation
Troubleshooting FS/deF
Normal display when heat pump is in defrost mode. Defrost can
occur any time the outdoor ambient temperatures fall into the mid
50’s or below.
If you have FS/ deF when temps are above mid 50’s
This could be an indication the defrost temperature sensor is
failing. Check sensor against resistance charts on page 11. If
sensor resistance does not match with correct reading from chart
replace sensor. If resistance is correct replace control board
Summit
Defrost Sequence
Heat Pro
When defrost sensor senses a coil temperature of 29 ⁰F , the control
board cuts the compressor off but leaves the fan running for 15
minutes, the display will show only the water temperature during this
time. If temperature of sensor is 50
⁰F
or above after 15 minutes the will
compressor restart and the heat pump is operating normally. If the
temperature has not reached 50 ⁰F the heat pump will go through up to
2 more 15 minute cycles. If after the 3
rd
cycle the temperature is still
not above 50 ⁰F the heat pump will shut down for 2 hours and show
deF on the display.
Defrost Sensor Wire Location
Defrost Sensor Wire Location
HeatPro
Note: Defrost sensors are attached
to suction refrigerant line with
the TXV bulb.
Summit
When defrost sensor senses a coil temperature of 29
⁰
F, the control cuts the compressor off and leaves the fan running. The
display shows FS. The heat pump will continue to operate in this way until the sensor senses 42
⁰
F. Once the sensor reaches 42
⁰
F
the compressor will restart and the heat pump is operating normally.